I could be wrong but I think there is some discretion allowed. Say if the ORD sensor acts up again later and drops to 69 or something but it's clearly illegitimate, then I don't think they have to go with that reading. RC or one of the other mets could clarify though because again I may be misremembering how that works.
As far as the monthly record, at this point I think it's more likely than not that it gets broken, but it's not a done deal yet by any means.